Handwriting analysis and forged documents

Documents of various types may be altered, partially erased or forged for innocent or criminal reasons. Notes written on a sheet from a note pad, which is then torn off, may leave an indented, but invisible copy on the sheets below. Invisible indented writing on a notepad may be visualised and from which handwriting analysis can be undertaken to discover the identity of the author. In the case of suspected forged documents it is often also possible to discover if the document has been altered or erased and how.